05-12-2019 09:33 AM - edited 05-12-2019 09:35 AM
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So, I'm trying to understand trunking better. I was under the impression that if Trunk Ports were created, I could allow Vlan Traffic through from other VLANs, if they are "allowed" through the Trunks on each port. So, given the preceding topology, where each switch has VLANs 2, 3, and 4 and all are in the same subnet I was wondering why I couldn't successfully make any of the PC ping; they are attached to Trunk Ports? Do I absolutely have to have a router/L3 Switch for this?
Thank you.
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05-12-2019 12:00 PM
Hi @GillverK ,
When the packets arrive at a switch, they receive a tag, which associates them with a specific difussion domain(vlan).
By default this tag is 1.
Now, if you occupy several vlan, the packages will be tagged with those tags, so you can not communicate devices from different vlan.
Trunk links are used to allow the passage of packets with different tags, but not to achieve communication between them.
To achieve communication between vlan, you need a routing device, such as a router or an L3 switch.
Regards
05-12-2019 10:30 AM
- ip routing and trunks are in fact unrelated. Most people will map an IP subnet to a VLAN. But if you need comm between IP subnets you need a routing-solution somewhere.
M.
05-12-2019 03:04 PM
Ah, I see. I wish the lessons I'm taking would stress this fact.
Thanks a lot.
05-12-2019 12:00 PM
Hi @GillverK ,
When the packets arrive at a switch, they receive a tag, which associates them with a specific difussion domain(vlan).
By default this tag is 1.
Now, if you occupy several vlan, the packages will be tagged with those tags, so you can not communicate devices from different vlan.
Trunk links are used to allow the passage of packets with different tags, but not to achieve communication between them.
To achieve communication between vlan, you need a routing device, such as a router or an L3 switch.
Regards
05-12-2019 03:05 PM
Yes. This explains a lot. Than you.
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